Stopper for vacuum-insulated vessels.



H. KLETT.

STOPPBR FOR VACUUM INSULATBD VESSELS.

APPLIUATION FILED MAILS. 1910.

Patented M3115, 1912.

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Wa'zescsegs/ vand are connted together.

HUGO KLETT, OF ILMENAU, GERMANY.

STOPPEB FOB VACUUM-INSULATED VESSELS.

Specification of Letters Patent.

Patented Mar. 5, 1912 Application led March 9, 1910. Serial No. 548,238.

stopper 'for sealing or closing the space` or chamber betweenl the double walls of the vessel after the. creation of the vacuum therein has been completed.

` A structural embodiment of the invention is illustrated in the accompanying drawing, whereof- Figure 1 is a vertical sectional view, with arts in elevation, of a vessel of the aboveescribed type, furnished with the improved Stoppers; and Fig.'2 is a'plan view.

The vessel proper and its cover are each provided with an inner wall a and an outer wall 'b which are glazed upon both sides The outer walls of both of the parts mentioned are formed at suitable points with tubular projections d whose bores open into the s aces or chambers c between said walls an the inner walls a. Each ofv these projections which is ground or otherwise tightly fitted therein. These stoppers are ho ow, as shown in-Fig. 1, and are constructed of glass or other suitable vitreous material; their inner end walls are 1 providedv with openings which vform a y means of communication between the in terior of the Stoppers and the adjacent space or chamber c, and their outer end walls are provided with nipples g. The air contained in said spaces or chambers is exhausted therefrom through the Stoppers in any preferred manner, and, after the completion of that operation, the nipples' are fused or melted and closed, thereby sealing said spaces or chambers. Finally, the outer ends of the bores of the said projections d are filled with a rapdly-solidifying substance or material, as indicated by the letter It, Fig. 1.

I claim as my invention: p

1. A hollow stopper of fusible vitreous material for use in connection with double walled Vessels having an air space between said "walls, wherein a vacuum is to be created, said stopper being formed at its inner end with an opening communicating directly with said air space and at its outer end with a nipple adapted to be closed by melting after the creation of the vacuum in the air space has been completed.

2. A hollow open-ended glass sto per for use in'eonnection with ldouble wa led vessels having an air space between said walls, wherein a vacuum is to be created, the

outer end of said stopper being adapted to Y In testimony whereof 'I havehereunto set my hand inv presence of two subscrlbmg witnesses.

' HUGO KLETT.'

' Witnesses: I

ERNST EBERHARDT, BERTIGE B. vBuscan. 

